Rotary brush



H. WIIVIIVIER.

ROTARY BRUSH.

APPLICATION FILED oT. Is, 1920.

Patented Oct. M, 1921,

llezmm.

IIIIIIIIIII titl of Maine,

'and through these HUGO WIMMER, 0F BATH, MAINE.

ROTARY BRUSH.

Specification of Letters Patent.

Patenten oet. it, reet.

Application tiled October 18', 1920. Serial No. 417,787.

To all whom t may concern.'

Be it known that ll HUGO WIMMER, a citi- .zenv of the United tates, and resident of Bath, in the county of Sagadahoc and State have invented certain new and useful Improvements' inRotary Brushes, of which the following is a specification.

The'object of this invention is to provide a brush adapted especially for cleaning ships bottoms and the like where it is desirable to use a brush that is capable of cutting particles of paint and rust and removing them from the metal or wood surface of the ship. llt will, of course, be understood, however, that the'brush is capable of many uses and l do not wish to limit it in this respect.

lin the drawing: j

Figure 1 is a side elevation of the device complete; f y

Fig. 2 alongitudinal central sectional view of the brush;

Fig. 3 a face view of the inner side of the brush head; v Y

Fig. 4 a similar View of the outer side of the brush head, most ofv the cutting bristles being removed; and

Fig. 5 a detail perspective view of yone ofthe cutting strands or bristles.

Referring to the various parts by numerels, l designates a motor, thecasing of which is formed with' a hand grip 2 at one end by which it may lated by the operator. This motor may be of any suitable type, either electric or pneumatic, but is preferably pneumatic and of convenient size for manipulation by the -operator. The rotary brush is connected directly tothe shaft 3 of the motor,vsaid shaft projecting outwardly through a nipplev 4 forming a part of the motor casing. The motor l is shown merely in outline in Fig. 1 and it is thought unnecessary to completely illustrate its details of construction in this case. rlhese motors are well known and any suitable and desirable type may be used in connection with this invention.

The brush consists ofa'circular brush head 5 preferably of wood, tapered slightly toward its inner face, as shown clearly in Fig. v2. This wooden brush head is perforated i the bristles or brush elements 6. These brush elements are formed preferably of Hat steel strips bent into U-shape, as clearly illustrated in` ige. Atand 5. These U-shape be held and manipuperforations are insertedbrush elements are passed through pairs of adjacent perforations, as shown clearly in Fig. 4, the curved portions of the brush elements being received within an annular flange 7 formed on the inner face ofthe brush head. The brush elements or bristles are formed of flat steel strips inv order'to increase their cutting and cleaning effect. These brush elements are of 'considerable length in order that they will be resilient and fieXible.- The outer face of the brush is covered by a circular protective plate 8, said plate being formed with an annular flange 9 which tits over the edge of thebrush head, as shown clearly in Fig. 2. The brush head fits4 within a brush cup 10 which is formed with an outwardly flaring annular side wall 1l, said wall closely embracing the tapered brush head. Connected rigidly to the center ofthe brush cup is a short stub shaft 12. The brush head is detachably secured within the brush cup by means of a central screw 13 which is passed through the brush headand into the end of the stub shaft, as shown clearly in Fig. 2. To remove the brush head from the cup, it is only necessary'to detach thescrew 13. This provides a ready means for attaching and detaching the brush head from the brush cup. rlhe brush cup also serves as a means "to hold the bristles or brush elements in place while the brush is in use. The stub shaft 12 is adapted to be threaded on the end of the motor shaft 3, so .that the brush is rectly connected to the motor shaft.

Surrounding the stub shaft 12 and directly threaded on the, end of the nipple 4 is a tubular hand grip 14 which is non-rotatable and is provided at its outer end, close to the brush cup, with a'radial guard flange 15. This grip is adapted tov be grasped by the operator and the guard flange 15 protects the hand of the operator from the rotating brush. l

The grip 14 is slotted transversely near its inner end, that is to say, theend which is connected tothe rigid nipple 4, as shown at 14, to permit the shaft 3 to be reached by a spanner or other device when connecting or disconnecting the shaft 12 from shaft 3. The shaft 3 is flattened, as shown at 3, at points which register with the slots 14aso that they may be reached by the Spanner and the shaft held from rotation while attaching the brush to the shaft or when detaching it therefrom.

In manipulating the brush the operator grasps the motor by the handle 2 and the grip 14 and places the brush against the surface to be cleaned. The brush is rapidly rotated and the operator forces the cutting brush elements against the surface with the desired pressure to insure the complete cutting and removal of the paint particles, rust or other foreign matter which it is desired to remove. The flat steel brush elements form a very effective cutting means and as the brush is moved over the ships bottom, or the like, it will effectually clean it. The plate 8 protects the wooden brush head and maintains the brush ele-ments in their proper relation to each other. This protective plate is essential in order to protect the wooden brush head from wear due to flexing of the steelbrush elements. By securing the brush head in the brush cup, as described, the brush elements are maintained in the brush head and it is unnecessary to use any other means for securing them in position. This makes it a simple matter to renew'the brush elements when they are worn or broken.-

The shaft 12 need be only long enough to permit of the use of the grip 14, so that the brush is mountedy close to the motor frame and the entire tool is of convenient size for manipulation by the operator.

What I claim is:

1. A rotary brush comprising a stub shaft provided with means at one end thereof for connecting the same to a drive shaft, a brush cap rigidly secured to the other end of said stub shaft and having an annular outwardly flaring side wall, a frusto-conical brush head fitting closely in said cap and having longitudinally extending apertures therethrough, tufts of brushing elements having intermediate portions extending over the smaller end of the brushhead and end portions extending through two different apertures in the head, and a screw extending through the brush head, and cap and having its inner end threaded into the adjacent end of the stub shaft for detachably holding the brush head in the cap with the intermediate portions ofthe tufts of brushing elements clamped against the base of vthe cap.

2. A rotary brush comprising a stubl shaft, a tapered cup-shaped brush cap having the base thereof rigidly secured to one end of said shaft, a tapered brush head adapted to fit tightly in said cap, brushing elements held to said brush head and projecting from the larger end of the head, and a screw passing through the head and cap and having its inner end threaded into the adjacent end of the stub shaft, said screw extending longitudinally of the shaft and detachably holding the head in the cap with the sides of said head and cap in close contact.

3. A rotary brush comprising a cap having a tapered brush-head cavity increasing in diameter toward the open end thereof a frusto-conical brush-head, tufts of bristles held to the brush-head and projecting from the larger end thereof, a protecting plate extending over the larger end of the brushhead and provided with an annular flange closely embracing the lower end of the tapered outer surface of the head to lock the plate to the head, said plate having apertures therein through which the tufts of bristles extend, and means for detachably holding the brush-head in the cap with the smaller end of the head fitting tightly in the cavity in the cap.

4. A brush comprising a cap having a brush-head cavity increasing 1n diameter toward the open end thereof, a frusto-conical brush-head having apertures extendingv from end to end thereof, U-shaped tufts of `bristles each having-the transverse portion tending through two adjacent apertures in the head, and means for detachably holding the .head in said cavity with the tapered sides of the cavityl and head in close contact and the transverse 'portions of the tufts of bristles clamped between the base of the cavity and the smaller end of the head.

A rotary brush comprising a stub shaft provided at one end with means for attachment to a drive shaft, a brush` cap rigidly held to the other end of said stub shaft, a brush-head fitting tightly in said cap and provided with apertures, U-shaped tufts of bristles each having the transverse )ortion thereof extending over the inner endl of the head between two. adjacent apertures and the end portions thereof extending through said apertures, and a screw extending through the head and cap and' having its inner end threaded into the adjacent end of the stub shaft, said screw extending longitudinally of the shaft and detachably ho ding the head in the cap with the transverse portions of the tufts of bristles clamped beween the top wall of the cap and the inner end of the head. l

In testimony whereof I hereunto aix my signature.

HUGO WIMMER. 

